On Windows 10 many programs are using the small cores and games could drop by about 50 fps, Windows 11 is a must have. DDR4-3600 Gear1 is possible and (unsurprisingly) best choice for high fps gaming. DDR5 is Gear2 by default, Gear4 is for 10000+ speeds. 40% higher latency on DDR5, might need 8000+ speeds to compensate. The best ADL-S is definitely better than 5950X for gaming. Good heat dissipation.
Yeah, leaks are flowing in, with each passing day. Pretty much expected stuff, maybe Intel will pull a wonder uCode for DDR5, cause right now things are not looking good for it. Very interesting situation for well-informed enthusiasts: DDR5 comes with penalties, while there are no true higher end Z690 motherboards with DDR4.
Mobo makers will keep on selling stuff, but they will be missing at least $150 from me.